I replaced my Digitone with an Argon8m and a Modor NF-1(m), because I had some money to spare. But if I had to decide for one synth, I’d have gone for the Roland JD-08, at that time, it is multitimbral, has lots of polyphony and FX, and it sounds great.
FWIW, I added an MS70 to my Blofeld because I wanted more (and better FX).